The distribution of the culture of the bronze took the Dianchi Lake area as the core

Performance comparison shown in Figure 15. C4083S alloy due to its phase transition temperature higher cooling rate requirements are more stringent, laboratory simulations at different temperatures under air cooling and furnace cooling, water quenching and cooling system, its hardness index changes shown in Figure 16. C4083S alloy production even if the air-cooled, its hardness is less than the required standards must be water-cooled, increasing the cooling rate can significantly increase its hardness index, according to the characteristics of the alloys tested with artificial water spray cooling process. The official excavations to the culture of the bronze began at the establishment of the Yunnan Provincial Museum in 1951.  However, this cooling method is very uneven, and the cooling rate is not ideal, although the material properties greatly improved, shown in Figure 17, but still less than the required standards, thereby increasing the key of the alloys: the development of certain pressure of the strong cooling water loop to further enhance the cooling rate, alloy extrusion to achieve a cooling rate of the sub-quenched state.
Air-cooled HRB92.5 (Al2.75%) air-cooled HRB86 (Al2.92%) Figure 15 MBA-alloy extruded pipe air-cooled and air-cooled microstructure and performance comparison of 16 250 water quenching air-cooled furnace cooling the HBW 200 150 100 ℃ 750 800 550 600 650 700 heat treatment temperature of the original extruded's state HWB178 600 ° C quenching, air cooling, furnace cooling to 700 ° C air-cooled quenching the 700, 750 ℃ 700 ℃ furnace cold Figure 16 C4083S alloy pipe of different heat treatment system performance and organizational 200 195 190 185 frequency after the extrusion of the middle of the tail of the HBW 180 175 170 165 160 head of F = 6 Figure 17 C4083S alloy hardness distribution of water-cooled test (in respect of the trial six extruded tube performance to do the accuracy. The distribution of the culture of the bronze took the Dianchi Lake area as the core.
 Of the extruded pipe statistics to control high-strength wear bronze extruded precision are higher, with extruded pipe to the synchronizer ring, for example, the product accuracy requirements are reflected in the following aspects:  pipe diameter size deviation. Extruded pipe outside diameter tolerance demanding, generally about 1% of the nominal diameter of the strict + 0.5%, far higher than the limits prescribed by GB in production must be strictly according to the material thermal expansion characteristics of the different temperatures, reasonable design margin squeeze tool and die, strict implementation of extrusion operating procedures and process specifications (such as tool and die preheating systems, etc.) in order to ensure that the inner diameter tolerance of the product. Ten thousands of bronze were found in over 40 locations scattered in more than 20 cities and counties kike Kunming.
This indicator reflects the degree of inside and outside the circle concentric, is to ensure that key indicators of the size of the synchronizer ring fine car, is now generally eccentricity ≤ 7%, the adjustment of the extrusion equipment must be very carefully, according to the circumstances of the equipment, select reasonable specifications of the ingot, extrusion system using reasonable to select a reasonable type of piercing needle in order to effectively control the drift of squeeze perforations piercing needle to produce concentricity to meet the requirements of the pipe after the fumble, has acquired control of eccentricity technology, the production of pipe eccentricity general control below 6 percent, the best can be controlled at about 5 percent, fully meet the requirements of domestic and foreign users of the eccentricity. In terms of the shapes of bronze, the production methods of the Western Zhou Dynasty as the same as the period of Xia and Shang.